Χλαμύς

Numa, the first king of the Romans, when he received an embassy of the Isaurians and observed their type of apparel, borrowing from them invented the wearing of the chlamys, uniting royalty with the senate, not putting the purple dye on the outside, but putting it underneath; so that from each of these one body was created and the Roman kappa was marked on the sandals of the senators.¹
And [there is] a proverb: 'Syloson's chlamys'.² [It is used] in reference to those being pretentious in their apparel; for this man had very rich clothing, which he gave as a gift to Darius when [Darius] was still a private citizen; and after this, when Darius had become king, he made a return.³